During the cold winter months, a sheet of ice covers a lake near the arctic circle. at the beginning of spring, the ice starts to melt.
the variable
ss
s

models the ice sheet's thickness (in meters)
tt
t

weeks after the beginning of spring.
s=−0.25t+4s=-0.25t+4
s=−0.25t+4

by how much does the ice sheet's thickness decrease every
66
6

weeks

Decreased by 1.5 meters and is now at 2.5 meters.

Step-by-step explanation:

s=−0.25t+4 represents the thickness of the ice over t weeks. To find the thickness at 6 weeks, substitute t=6.

s = -0.25(6)+4 = 2.5 meters

It started at t= 0 at 4 meters. So it decreased by 1.5 meters.

The start of spring has 4 meters because when t= 0, s= -0.25(0)+4 = 4

45 minutes

step-by-step explanation: